SETELEV

Description

SETELEV sets the elevation value using bilinear interpolation for georeferenced coordinates. The new elevation value will overwrite the previous elevation value for every vertex from the specified vector layer.

Parameters

Name	Type	Length	Value range
InputDem: Input elevation channel*	Raster port	1 - 1
InputVec: Vertex layer*	Vector port	1 - 1
OutputVec: Output vector segment*	Vector port	1 - 1

* Required parameter

Parameter descriptions

InputDem: Input elevation channel

Specifies the image channel that contains the DEM information.

InputVec: Vertex layer

Specifies the vector segment that contains the input vertices.

OutputVec: Output vector segment

Specifies the vector segment that contains the input vertices.

For every input vertex, SETELEV calculates the elevation value using bilinear interpolation for georeferenced coordinates, and overwrites the previous elevation value.

Details

SETELEV sets the z-coordinates of vectors in an output vector layer from the values in the DEM channel of an image file.

Bilinear interpolation determines the gray level from the weighted average of the four closest pixels to the specified vertex x- and y- coordinates, and assigns that value to the z-coordinate of the vertex.

To verify the results of SETELEV, you can run VECREP.